Thermo-operated diluting-valve for carbureters.



C. F. ROBBINS. T HERMO OPERATED DILUTING VALVE FOR CARBURETERS.

APPLICATION FILED MAR. 9, I914.

Patented Sept. 5, 1916.

ATRIVEYJ/ UNITED STATES THEBMO-OPERATED DILUTING-VALVE FOR CARBUBLETERS.

m Specification of Letters Patent.

Patented Sept. 5, 191a.

Application filed March 9, 1914. Serial No. 823,541.

To all whom it may concern:

Be it known that I, CHARLES F. ROBBINS, a citizen of the United States,residing at Washington, District of Columbia, have invented new anduseful Improvements in Thermo-Operated Diluting-VaIves for Carsbureters, of which the following is a specification.

This invention has to deal with carbureter regulation whereby the properexplosive mixture both for starting and running condi: tions will beproduced at all times irrespectively of daily and seasonal temperaturechanges, and the invention relates more particularly to mixture dilutingmeans of that type including a thermo-responsive means which variesautomatically the proportion of air to fuel according to atmospherictemper-.

ature variations, reducing or shutting 0d the diluting air as thetemperature falls from a given. point or increasing the amount as thetemperature rises for the purpose of insuring an efiicient andeconomical mixture.

The general object of this invention is to combine with a carburetor,having main and secondary air admitting means, a tertiary air admittingmeans of simple, eflicient and novel form which is thermally actuated sothat with variations from warm to cold weather, or vice versa, thetertiary air admitting means will close or open more or less asconditions require to maintain a proper fuel mixture.-

Another object is to so design the thermoresponsive mixture dilutingdevice that it can be applied to any carbureter as an attachment in anextremely simple manner and with highly beneficial results, in regard tofuel consumptiomimp'roved running of the engine, elimination of startingtroubles in cold weather, and avoiding hand adjustment-of the secondaryair valve with temper ature changes.

The carrying out of the inventionwill be,

more fully set forth hereinafter, in connection with the accompanyingdrawing and the novel features will be defined in the appended claims.

In the drawings: Figure 1 is a side view of a carbureter with theimproved mixture diluter applied thereto. Figs. 2 and 3 are enlargedsectional views of the diluter removed. Fig.4 is a side view ofa'carbureter having a modified form of mixture diluter attached thereto.Fig. 5 is a plan view of the attachment, and Fig. 6 is a perspectivelview of the diluting valve and its guide.

Referring to Fig. 1 of the drawing, A designates an ordinary carbureterand B the thermo-mixture diluter therefor, which is shown in detail inFigs. 2 and 3. The carbureter comprises a mixture chamber I which has amain air inlet 2, and an auxillary air inlet 3 controlled by a springseated suction opened valve 4, to dilute the mixture produced by themain air passing and draw- 1ng out fuel from the nozzle 5 that iscontrolled by a needle valve 6 and receives its supply from the bowl 7wherein a constant fuel level is maintained by a float 8 connected withand controlling the fuel valve 9 for the fuel inlet pipe 10, the fuelmixture being supplied to an engine or other consumption means throughthe manifold 11 and the quantity of mixture being controlled by athrottle 12. All that is necessary to be done to the carbureter, inorder to attach the invention B thereto, is to drill and tap an opening13 in the body of the carbureter at any suitable point so that air can.be admitted to control the nature of the mixture to suit therequirements of temperature.

The attachment comprises a tertiary air admitting means, the inlets 2and 3 being respectively the main and secondary air admitting means ofthe carbureter.

The attachment B comprises a drum or other chambered body 14 which is,adapted to be connected by a pipe 15, or in any other manner with theopening 13 and atmospheric air is admitted to the body 14 through a port16, the effective area of which is varied by a valve 1'2. controlled byand connected with a thermo-responsive device of any suitable character.The thermo-responsive device 18 shown is of the difl'erentiallyexpansive bimaterial type, fastened at one endto a bracket 19 andconnected at the opposite end to the valve. The thermo-responsive deviceis curved around the body 14 so as to give the desired range of actionand yet take up but very little space. The free end of thethermo-responsive device has a resilient extension 20 which is bent insuch a manner as to""hold the valve 17 tensioned against or 105 seatedon the outerperipheral surface of the PATENT orrron.

' temperatures.

. tertlary air admitting means is inoperative and does not dilute themixture, but as the be closed at certain low temperatures and fully openat certain high temperatures and will be open more or less atintermediate Thus in cold weather the I temperature increases, the valveof the tertiary admitting means opens to admit the proper amount ofdiluting air to the mixture in the carbureter and consequently efiicientcombustion and maximum power are rendered possible.

To facilitate starting, a suction valve may be used to hold the port 16closed until the engine runs by explosions. A valve 21 in the form of alight leaf spring, is fastened in the body 14 with the free end of thespring covering the port 16. This valve will not uncover the port underthe suction of the enginewhen cranking by hand to start the engine, andhence too much air is prevented from entering the carbureter, when,a

rich starting mixture is required, but when the suction of the engineincreases due to high speed after being started, the valve 21 will openand admit air provided the.

thermo-responsive device is holding the valve 17 open. A protective capor casing 22 covers the body 14, valve 17 and thermoresponsiv device 18,and this casing, which 4 has a threaded connection with the flange 23 ofthe body 14, has openings 24 to admit air to the port 16.

In the modified form of the thermally actuated mixture diluter shown inFigs. 4, 5, and 6, the thermo-responsive device 25 is mounted directlyon the body of the carbureter O and the valve 26 that is connected withthe thermo-responsive device is slidable in a guide 27 which is fastenedto the carbureter at a port or opening 28. An adjustable connectingmeans 29 unites the valve with the thermo-responsive device whereby theproper set of the valve with respect to the port 28 may be obtained. InFig. 5, the valve, like the valve in Fig. 2, is 'shown partly open sothat airis admitted to the carbureter, and as the temperature rises orlowers,'the valve will open still further or move to closed positionautomatically through the agency of the thermo-responsive device. Bothforms of the device are extremely efiective in practicalop'eration.

The matter herein claimed is an improvepending application, SerialNumber 748,511, filed February 15, 1913.

What I claim as new, is:- s I 1. The combination of a carbureterincluding main and secondary air admitting means, with a tertiary airadmitting means controlled by temperature variations, and

comprising a unitary self-contained device attached to the carbureter.

valve operated by difference in internal and external air pre$ure, asecond diluting air valve, and a thermo-responsive device external tothe carbureter and connected with the second valve to close and open thesame according to temperature variations.

3. The combination of a carbureter having a mixing chamber provided withan air admitting means, with an attachment wholly exterior to the bodyof the carbureter and comprising a valve for controlling the amount ofair admitted through said means to the mixing chamber, and athermo-responsive device for actuating the said valve.

4. The combination of a carbureter, with a thermally controlled mixturediluting attachment communicating with the mixture chamber of thecarbureter, said attachment being wholly outside the carbureter andcomprising a valve closed at low temperature,1;;and a thermo-responsivedevice for opening and closing the valve.

5. The combination of a carbureter, with a thermally controlled mixturediluting at-. tachment, comprising a port through which air is admittedto the carbureter, a suction actuated valve controlling the port and athermally actuated valve for controlling the port.

6. As a new article of manufacture, a

unitary device embodying a thermo-responsive mixture diluting attachmentfor carbureters, comprising a ported body adapted to communicate withthe mixture chamber of the carbureter, a valve for opening and closingthe port, and a thermally responsive actuator for the valve.

7. A thermo-responsive mixture diluting ported body adapted tocommunicate with the mixture chamber of the carbureter, a

device fora carbureter, comprising a chambered body having a portthrough which air is admitted to the carbureter, a suction valve withinthe body 'for controlling the port, a

attachment for carbureters, comprising a valve outside the body forcontrolling the port, a thermo-responsive device arranged to actuate thevalve, and a protecting casing inclosing the second valve andthermoresponsive device.

10. The combination of a carbureter having a mixing chamber providedwith a port in its wall through which air is admitted to dilute themixture, a valve for controlm ling the port, a thermo-responsive devicemounted outside the carloureter and c011- nections' between the valveand thermoresponsive device and also located outside the carbureter.

In testimony. whereof, I have signed my 15 name to this specification inthe presence of two subscribing witnesses, this 9th day of March, 1914:.

CHARLES F. ROBBINS.

Witnesses: I

EDWD. T. LEWIS, E. T. BRANDENBURG.

